Hundreds of millions working in co-operation just because they should, I kind of have a feeling that will never work. We can't get 435 people making 175,000.00 a year + fat bennies to get that done, what makes you think an entire population can do it for far less??? Your world is idyllic and i would whole-heartedly approve if it could work. However I'm looking at how to make the real world more tolerable. It's not about ridding the world of all of man's imperfections, it's about managing and containing them.
As for environmental degradation, I'm not sure where you live but I can SEE the improvements in Virginia from when I was a child. There aren't the beaches full of brown foam phosphates, rogue dumps at the end of every dirt road, waterways clogged with trash and chronically gray hazy skies. We have and continue to make improvements in that area.
Economic equality has never existed and never will. We've had this discussion before. All that setting a median standard does is breed mediocrity. Not that there isn't plenty of that as it is, but rewarding exceptional, leaves the door open for those willing to take advantage of the opportunity. As in any neighborhood though, if you leave a door open, sooner or later some unwanted guests will get in, but it seems ludicrous to me to bolt the door closed to all, because of the few.